"The Poison Pit has finally been released. The far east of Marada is uninhabitable and no one is quite sure why everything here is so poisonous. As more is found out about this area of Marada, a new world may one day be started here! In the meantime, a way to visit this mysterious Poison Pit has been found by completing the Poison Pit Treasure Map. Once completed, its safe for you to visit once every 12 hours for FREE.
Every visit will give you the chance to dip an item into the magic poison pit and watch what happens to the item. The rarity of the item you can dip will change each time you visit - between rarity 1 and 15. Dipping items into the poison pit can have all kinds of weird and wonderful outcomes! Items can turn into MP, BP, RP, Olympic Points, Account Upgrade Credits, gym and elite gym stats for your pets, different Skins for your character or other new, bonus items. If you are really, really lucky your item may turn into a retired item." (source: Marapets News 2-16-2015; Poison Pit Treasure Map pieces, 16 in all, can be obtained from purchasing the Poison Account Upgrade where you will receive 7 map pieces with every account upgrade purchase.)